The hardware design of this project consisted of conditioning
signals to be accepted by the various ICís.†
The three ICís that we used in this design were:

∑Atmel Mega163
Microcontroller

∑Analog Devices AD724 RGB to NTSC converter

∑Elm Electronics Sync Generator

We used various resistors and capacitors in our design, but
they serve solely as impedance matchers, voltage dividers, etc.† The general idea is that the Elm chip uses a
crystal to generate a composite horizontal and vertical sync signal.† This signal is fed to both the AD724 and the
Mega163 (which is located on an STK500 development board).† The Mega163 uses the sync signal to determine
when to begin outputting color data to the AD724.† The AD724 takes the color signals from the
Mega163 and combines them with the composite sync signal from the Elm chip to
form a valid NTSC TV signal.† That signal
is then fed to a TV.† The schematic for
our project is shown below: